AIRPLANE
OPERATIONS
MANUAL
ICE AND RAIN
PROTECTION
REVISION 39
2-15-10
Page
15
Code
01
AOM-145/1114
LAVATORY WATER DRAIN AND NIPPLE
HEATING SYSTEM
The lavatory waste water drain and water service nipples (overflow and
fill) are heated by electric resistors to prevent clogging by water
freezing under any atmospheric conditions on the ground and in flight.
The heating is automatically turned on when the DC BUS 1 is powered.
Refer to Section 2-2 – Equipment and Furnishings.
ICE PROTECTION CONTROLS AND
INDICATORS
ICE PROTECTION CONTROL PANEL
1 - ENGINE AIR INLET ANTI-ICING BUTTONS
− Turns off (released) or permits (pressed) the automatic activation of
the associated engine air inlet anti-icing subsystem.
− A striped bar illuminates inside the button to indicate that it is
released.
− An OPEN inscription illuminates inside the button to indicate that the
associated engine air inlet anti-icing valve is open.
2 - WING ANTI-ICING BUTTON
− Turns off (released) or selects the automatic mode (pressed) of the
half-wing anti-icing subsystems.
− A striped bar illuminates inside the button to indicate that it is
released.
− An OPEN inscription illuminates inside the button to indicate the
following conditions:
− Both valves are open with the system commanded to open.
− At least one valve is open with the system not commanded to
open.
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